I noticed there are two dots on the side of the horseshoe and 8.6 MPH next to it can you please elaborate on how you guys came up with that number and how it works.

8.6 is the average target speed sprinting across a street or alley way holding a weapon. It's been used for years by snipers to deal with limited exposure targets.This normally would be done with a mill dot system and a lot of training.